<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>后代选择器</title>
    <style>
        div span {
            background-color: aqua;
        }

        div .last {
            color: red;
        }
    </style>
</head>

<body>
    <div>

        <span>哈哈哈哈哈哈哈哈哈</span>
    </div>
    <p>
    <div>
        <span class="last">
            呵呵呵呵呵呵呵
        </span>
    </div>
    </p>

</body>

</html>